"I don't have a grudge against your airlines, Miss, I just have a grudge," is what DB Cooper reportedly said.
Now, what does it mean? Hmmm. Did he hijack 305 because he had a grudge? Yes, you could make that argument. Was he a gentleman because he used the word, "Miss?"
And so it goes.
All we really know and can agree on is Georger's nickname, "Grumpy."
As for the grudge quote, I did include it in the book, but I refrained from giving it a definitive assessment. I'm not sure what anyone thinks it means, or its specific value in determining DBC's psychological state. I believe it gets put into the general collection of sayings, attitudes, gestures, etc that make up the general persona of DB Cooper, along with nicotine-stained fingers, looking like a businessman, and generally acting like a gentleman although he got a bit giddy when the money showed up. But cool and competent while hijacking an airliner.
As Waugh told me, "It looked like a SOG operation. Well-planned and well-executed."
Also, Cooper's actions can be compared with the copycats. His behavior stands out as much more sophisticated. Plus he had sustained, deliberate interactions with the flight attendants, and kept himself veiled from 36 passengers for over two hours. Impressive crowd control, imho.